Manchester United's 3-1 win over rival Chelsea was marred by an injury to Javier "Chicharito" Hernandez from a nasty two-footed challenge by Ashley Cole that Man United boss Alex Ferguson said took the shine off the big win.

The Chelsea left back was cautioned for his assault on Hernandez but no penalty kick was awarded. The Mexican striker was forced to come off with an injury that could keep him out for at least two weeks.

"For me it's a shocking tackle," said Ferguson. "The referee has booked him (Cole) and if he's booked him I don't know why it wasn't a penalty. We're going to have to wait until the morning because at the moment his leg is very numb. He could be out for a couple of weeks anyway."